Unequivocally built for speed, SRAM's Rise XX rear wheel is the cream of the crop. This ultra-featherweight hoop with Carbon Tuned rims and butted stainless spokes blend just enough strength and stiffness with a gravity-defying low weight. There's no waiting for engagement, as the Double Time ratchet mechanism ensures the wheel moves as soon as your legs do. Once they start spinning, there's almost no stopping the incredibly smooth, durable Speedball Ceramic bearings. Amongst carbon tubular wheels, SRAMs Rise to the top.